An endoprosthesis for total arthroscopic cruciate ligament reconstruction of the knee

Abstract

The invention discloses an endoprosthesis for reestablishment of knee joint cruciate ligaments under a full arthroscope. The endoprosthesis comprises a first bolt prosthesis and a second bolt prosthesis which are connected to a thighbone and a shinbone respectively, wherein an artificial tendon prosthesis is connected between the first bolt prosthesis and the second bolt prosthesis; each of the first bolt prosthesis and the second bolt prosthesis comprises a bolt prosthesis front section and a bolt prosthesis back section, and the bolt prosthesis front section and the bolt prosthesis back section are in detachable connection with each other; the bolt prosthesis front section is provided with a self-tapping external thread capable of tapping into the thighbone and the shinbone; the outer surface of the bolt prosthesis back section is provided with an external thread continuously butted with the self-tapping external thread of the bolt prosthesis front section, and adopts a material capable of growing together with bones; and muscle tendon fixation forcing screws are arranged between the first bolt prosthesis and the artificial tendon prosthesis and between the second bolt prosthesis and the artificial tendon prosthesis. Physical fixation and biological fixation are combined to realize the reestablishment of the knee joint cruciate ligaments without establishing a bone channel penetrating through the thighbone, a knee joint cavity and the shinbone, so that operation difficulty is obviously reduced, various complications are avoided, the tensile force of the reestablished artificial ligaments can be adjusted, the operation accuracy is improved and the operation curative effect is promoted.

Description

technical field [0001] The invention relates to a cruciate ligament prosthesis of the knee joint, in particular to an internal prosthesis used for reconstruction of the cruciate ligament of the knee joint under total arthroscopy. Background technique [0002] With the increase of traffic accidents and the extensive development of sports, the cruciate ligament injury of human knee joint has become one of the most common injuries in the sports system. [Anterior cruciate ligament injuries. In: Orthopedic Knowledge Update Sports Medicine III, Garrick JG. (Ed), American Academy of Orthopedic Surgeons, Rosemont 2004.p.169.] report by Gordon MD et al.: In the United States, only anterior cruciate ligament injuries There were over 200,000 occurrences. In my country, there is no exact statistical data at present, but comparing the labor intensity and population base, plus the number of patients with posterior cruciate ligament injuries, the number must be higher than that in the Uni...

AI Technical Summary

Problems solved by technology

This kind of device for inserting fastening ligaments is obviously insufficient in terms of tensile tension resistance, and there are "bungee effect" and "wiper effect" at the same time, resulting in ligament displacement and tension failure, affecting healing ability and affecting the effectiveness of reconstructed ligaments

It can be seen that the design of this technical solution does not improve the relative displacement and insufficient healing ability between the graft and the bone; its structural design also does not improve the weak ability of the interface screw to resist the traction force, and it is difficult to avoid the failure when resisting the traction force. Ligament displacement; there is still the defect that it is difficult to adjust the tension of the ligament; its long-term healing method is the same as the current cruciate ligament reconstruction method, and does not provide better long-term healing stability than the current application method

Chinese patent document No. CN102614036A discloses an artificial knee prosthesis that retains the anterior cruciate ligament, which includes a cruciate ligament component anchored on the knee prosthesis, but it is essentially an extrusion that is only applicable to the knee prosthesis The fixation method cannot be used alone for arthroscopic cruciate ligament reconstruction. This component alone is not superior to the current cruciate ligament reconstruction method.

[0008] The Chinese patent application number 201180051302.6 discloses a fixation device for fastening tendons or ligaments, including hollow screws, connecting screws, tendon suspension devices with holes at the end, and a correction tool a and a shifter for adjusting the depth of entry of the hollow screws. Except for the correction tool b of the fixation device; this device is essentially still a fixation that relies on the establishment of a bone tunnel that runs through the femur-knee joint cavity-tibia, and relies on the correction tool a to drag and rotate the fixation device into the bone tunnel to adjust the ligament tension. Rely on the thread shape of the hollow screw to obtain stability between the fixation device and the bone; in order to allow the insertion of the correction tool, a larger bone tunnel than the usual cruciate ligament grafting is required in the femoral and tibial bone away from the joint cavity , causing greater damage to bone and soft tissue, and the resulting "wiper effect" is more serious, which is likely to cause loosening or non-union of the fixation device; the end of the hollow screw is open, and it is placed through the hollow screw from the bone tunnel away from the joint cavity. The connection screw has a great defect. Once the connection screw falls off in the soft tissue of the muscle or the bone medullary cavity of the femur, it will be difficult to remove, and the consequences will be disastrous; if the bone debris in the bone tunnel falls off into the hollow screw, the correction tool a or connection The screw will not be able to be placed, which will also cause the failure of the operation

It can be seen that the design of this technical solution does not improve the relative displacement and insufficient healing ability between the graft and the bone; its structural design also does not improve the weak ability of the interface screw to resist the traction force, and it is difficult to avoid the failure when resisting the traction force. Ligament displacement; its long-term healing method is the same as the current cruciate ligament reconstruction method, and does not provide long-term healing stability better than the current application method; although this technical solution has added a design to adjust the tension of the ligament, it brings new defects. It increases the difficulty and risk of the operation, aggravates the bone damage, and the overall design is not feasible for clinical application

[0009] All in all, the current cruciate ligament reconstruction method of the knee joint is difficult to guarantee the accuracy and stability of the reconstructed ligament, the function of the reconstructed ligament varies greatly, and the overall long-term survival rate of the reconstructed ligament is not high. It takes a long time to achieve a satisfactory curative effect, and once the reconstruction operation fails, it will further damage the function of the knee joint and bring further pain to the patient

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